Improvement in ice-plows



JAMES H. CUTTER.

Improvement in Ice Plows.

N0. 123,873. v Patented Feb. 20,1872.

iii/MM I Izwemiim mz/z UNITED STATES PATENT OFFICE.

JAMES H. CUTTER, OF CAMBRIDGE, MASSACHUSETTS.

IMPROVEMENT IN IC E-PLOWS.

- SPEorEIoATroN.

I, JAMES H. CUTTER, of Cambridge, in the county of Middlesex and Stateof Massachusetts, have invented certain Improvements in Ice-Plows, ofwhich the following is a specification:

Figure 1 of the drawing is a view of one side of the teeth, and Fig. 2is a horizontal section through the top of my improved blank or fronttoothof an ice-plow.

My invention relates to certain new and useful improvements inice-plows, whereby the obstruction of the passage of the teeth of theplow, caused by the blocking up of the groove and the wedging in of theblank or front tooth by the collection of the ice-cuttings in the grooveand on the tooth, is prevented.

My improvements consist in forming the blank or front tooth of anice-plow with a broad flat face sloping back to the main body of thetooth, and curving outward from top to bottom, instead of constructingit as heretofore, of one even surface with a straight face and curvedback, so that in its passage on the ice it lifts up and throws out ofthe groove the ice-shavings, and leaves a clear passage for the otherteeth of the plow; and, moreover, prevents the ice from collecting onthe tooth and wed ging it in the groove, which very often occurs whenthe blank tooth is made straight and of an even thickness throughout.

In ordinary ice-plows all of the cutting-teeth represented in thedrawing by the letters a a. a a are made with a curved face, I) b b b,and with a flange, f, sloping to the main body of the tooth, back fromthe face, and the front or blank tooth is formed with a straight'face ofan even thickness with the rest of the tooth and with a curved back.

In my improvements the face 01 of the front or blank-tooth 0 is curvedout from the top to the bottom, and formed with a flange, 0, similar tothe other teeth, a a a a. By the curved arrangement of the front tooth cthe whole face of the tooth is not exposed to the action of theice-cuttings, which are thrown up out of the groove, which is kept clearfor the passage of the other teeth a a a a by the broad face 61 of thetooth c.

Having thus fully described my improvements, what I claim as myinvention, and desire to have secured by Letters Patent, is-

An ice-plow, having its front or blank tooth 0 formed with a flange, e,and curving outward from top to bottom, substantially as specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

Witnesses: JAMES H. CUTTER.

SAML. M. BARTON, CARROLL D. WRIGHT.

